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Derivatives - Derivative Assets And Collateral Received (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Gross amounts of recognized assets	$ 765.0	$ 183.0
Gross amounts offset in the Balance Sheets	0.0	0.0
Net amounts of assets presented in the Statements of Condition	765.0	183.0
Derivative liabilities available for offset	(21.0)	(19.0)
Collateral received	(347.0)	(145.0)
Net amount	397.0	19.0
Derivative assets not subject to master netting agreements	4.0	0.1
Derivatives, interest rate contracts
Derivative [Line Items]
Gross amounts of recognized assets	702.0	162.0
Gross amounts offset in the Balance Sheets	0.0	0.0
Net amounts of assets presented in the Statements of Condition	702.0	162.0
Derivative liabilities available for offset	(7.0)	(6.0)
Collateral received	(327.0)	(143.0)
Net amount	368.0	13.0
Forward contracts
Derivative [Line Items]
Gross amounts of recognized assets	63.0	21.0
Gross amounts offset in the Balance Sheets	0.0	0.0
Net amounts of assets presented in the Statements of Condition	63.0	21.0
Derivative liabilities available for offset	(14.0)	(13.0)
Collateral received	(20.0)	(2.0)
Net amount	$ 29.0	$ 6.0

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